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Old 10-21-2012, 07:11 PM
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"SOMEDAY" has finally come!

I'm FINALLY going to get an engine built for the truck after too many years of "analysis paralysis", false starts and 100 other excuses. It's off to the machine shop in the AM! The end product will be a 9.17 to 1 310 CID SBC using an '87 roller cam block with Speed Pro flat tops; Comp Cams XR264HR-10 roller cam, '062 L31 Vortec heads, Performer intake w/Q-jet and Doug Thorley Tri-Y headers. I could have done a 350 too but I wanted to see what I could squeeze out of a streetable 305. The cam and heads were literally a last second change. I was originally going with a ZZ4 cam and L30 heads but my SCR was going to be pushing 9.9 to 1. The ZZ4 cam gave up too much low end to a Ramjet or Vortec cam acording to DD2000 and I don't really want to have to buy premium, especially with a 34 gal. tank! FWIW DD2000 shows the XR264HR making nearly identical low end TQ to the Ramjet and Vortec cams, actually just a hair more but not enough to talk about.

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Old 10-21-2012, 07:21 PM
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so what is it? 260 horse?350 torque?
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Old 10-21-2012, 07:25 PM
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Sounds like a good streetable combination.
Will the heads support the lift of that cam?
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Old 10-21-2012, 07:33 PM
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Originally Posted by vinniekq2 View Post
so what is it? 260 horse?350 torque?
I really don't like to quote DD2000 numbers, they don't mean much but I use it to compare potential combinations to actual builds I have done (years ago) or other real world builds. I have been able to duplicate real world results pretty closely but DD is always a bit higher. If this turns out and runs decent I may pony up for some chassis dyno time after break in. It looks that good.

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Sounds like a good streetable combination.
Will the heads support the lift of that cam?
Definitely. Wouldn't want much more though.
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Old 10-21-2012, 08:00 PM
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Awesome Best of luck. Looking forward to seeing your smokin tyres.
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Old 10-21-2012, 08:08 PM
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Awesome Best of luck. Looking forward to seeing your smokin tyres.
You and me both!
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Old 10-21-2012, 09:35 PM
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The cr is really low for that camshaft in a 305.
Getting the rear gear and torque converter right will be critical for that cam in a 305 in a truck.
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Old 10-21-2012, 11:17 PM
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Hippie, I have a Comp Cams Hydraulic Roller cam for sale that would work perfectly in your build. It's the smallest of the line, .206 duration @.050 and .500 lift. It's in excellant shape with less than 1500 miles on it. I don't have anymore use for it so I'll let it go cheap. PM me if your interested.
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Old 10-22-2012, 12:54 AM
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My c10 has a 305 performer cam w/ milled vortec 906 heads. A 305 for a daily powerplant is fine. Do not over cam a 305. Take advantage of its good points, the stroke and rod ratio. A big cam is going to place the band to high in the rpm range. Build the whole package to compliment. It will work well and perform.

Im set with a 3.73 gear and converter built by dynamic like the GNX style 3000stall. Very street friendly, and drives nice. Not slush box lose. A 2400-3000converter makes it fun.

260 hp is fun to cruise around and brake torque, nothing wrong with that. Plenty of good times with that.

In the recent years my 305 proved itself to last. So I supercharged it. Yowee, it has some power now at 10 psi.

Are you gonna find you an anlog girl? Did you listen to JLynne's album long wave?
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Old 10-22-2012, 06:21 AM
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Spinn, not disagreeing, just curious on why you feel 1.63:1 is a good rod ratio.
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Old 10-22-2012, 04:20 PM
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Good for a smooth daily drivin vehicle trying to pull with torque. Not saying it is good for a high winding drag set up.
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Old 10-22-2012, 07:25 PM
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Hows the rod ratio in a 318 dodge?
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Old 10-22-2012, 07:36 PM
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Quote:
Originally Posted by Hippie View Post
I'm FINALLY going to get an engine built for the truck after too many years of "analysis paralysis", false starts and 100 other excuses. It's off to the machine shop in the AM! The end product will be a 9.17 to 1 310 CID SBC using an '87 roller cam block with Speed Pro flat tops; Comp Cams XR264HR-10 roller cam, '062 L31 Vortec heads, Performer intake w/Q-jet and Doug Thorley Tri-Y headers. I could have done a 350 too but I wanted to see what I could squeeze out of a streetable 305. The cam and heads were literally a last second change. I was originally going with a ZZ4 cam and L30 heads but my SCR was going to be pushing 9.9 to 1. The ZZ4 cam gave up too much low end to a Ramjet or Vortec cam acording to DD2000 and I don't really want to have to buy premium, especially with a 34 gal. tank! FWIW DD2000 shows the XR264HR making nearly identical low end TQ to the Ramjet and Vortec cams, actually just a hair more but not enough to talk about.
my only question is why the machine work? Nothing wrong with a 305, but you have to scratch you head at spending money on a 305 when you can often get them for next to nothing with very little wear.

I'd just find a good cheap 305, do a "in the garage clean, hone, and rering" job on it and run it.
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Old 10-23-2012, 04:17 AM
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[QUOTE
I'd just find a good cheap 305, do a "in the garage clean, hone, and rering" job on it and run it.[/QUOTE]

With a bolt on supercharger..... Mine is on the stand now waiting for the blower. Doesn't even need a re ring. Getting fully ported #920 76cc heads.

7.4:1 cr 230+cfm ports 1.94x 1.50
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Old 10-23-2012, 05:00 PM
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Quote:
Originally Posted by ap72 View Post
my only question is why the machine work? Nothing wrong with a 305, but you have to scratch you head at spending money on a 305 when you can often get them for next to nothing with very little wear.

I'd just find a good cheap 305, do a "in the garage clean, hone, and rering" job on it and run it.

I'm building a 305 because I want to build a 305 and since I'm the guy paying the bills that's all the reason I need.
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